Driving at Rocky Mountain, the highest paved roads in any US National Park, you must read this:
High altitude driving.
Shuttle:
There are two shuttle services inside the park: Bear Lake Route Bus and
Moraine Park Route Bus. See detail
shuttle route map.
From May 14 to October 31 2004, the road from Sprague Lake to Bear Lake will be
accessible by shuttle bus ONLY due to road construction.
Hiking, Backpacking, Mountaineering, Fishing, Nature
Walking, Auto Touring, Snowshoeing and Snow Skiing, etc, see details at
Rocky Mountain
National Park activities.